We are coming down from Cozumel next weekend. Taking the ferry over to Playa, ADO from Playa to Chetumal, Menzies Tours and Transfers from Chetumal to Corozal and Tropic to San Pedro all for about $188 for 2 people. We are leaving Cozumel at 7am and should arrive in San Pedro about 4:00 (we like a little cushion time though). If you aren't leaving until after that, I can pm you after we get there and tell you how it goes.
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